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中国沙漠  2014 

干旱胁迫下钠复合肥对霸王（Zygophyllumxanthoxylum）根系生长的促进作用

DOI: 10.7522/j.issn.1000-694X.2013.00237

Keywords: 钠复合肥,霸王（Zygophyllumxanthoxylum）,主根,根系活力,抗旱性

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Abstract:

霸王（Zygophyllumxanthoxylum）是荒漠区广为分布的一种多浆旱生植物。采用盆栽育苗的方法，初步评价了干旱胁迫下Na+对霸王根系生长的贡献，探讨了一种新型钠复合肥对霸王根系形态、生理学指标的影响。结果显示，钠复合肥能显著促进霸王根系的生长并提高其抗旱性：（1）正常浇水时，钠复合肥对霸王的促进作用主要体现在株高的增加和侧根的增长上，根系活力显著增强；（2）自然干旱15d后，钠复合肥使得霸王根系活跃吸收面积显著提高24%，促进主根的加粗和伸长以吸收更多的水分和矿质养分；（3）干旱胁迫下，钠复合肥处理使霸王根部Na+浓度保持较高水平，K+浓度下降42%。因此认为，干旱前钠复合肥显著促进了霸王侧根的生长和根系活力的提高，干旱后钠复合肥通过促进根系活跃吸收面积的扩大和主根的生长以提高霸王的抗旱性，其主要原因是根和叶中积累了较多的Na+、而非K+。

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